G1/2B to NPT Coupling

Question

I'd like to retrofit our shower with a rain head by attaching a Kohler K-76331-CP diverter to where the current shower head comes out of the wall, then having one of the diverter's connections go to a regular shower head, and the other connection to the rain shower head.  The diverter connection that I'd like to use for the rain shower has male threads labelled G1/2B.

Normally this connection would point downward and have a hand-held shower hose attached to it.  What I'd like to do instead is have that connection point upward and attach a rigid 15-in pipe to it (e.g., a 15-inch nipple) to feed the rain head.  I called Kohler, and they said that there's no problem pointing the connection upward.  But I'm not sure how to join that G1/2B output to a rigid NPT pipe.

Is there a coupling I can use, or is there some other method of doing this--for example, a 15-in pipe that would have a G1/2B female connection on one end and an NPT male connection on the other end?

JPhi1618 · Answer

The G in the thread size looks like it denotes a British Standard Pipe (also known as BSP or BSPP) size of 1/2".  For whatever reason, Kholer decided to use this size on their hand showers, and that's what this valve is designed for.

You would need to find an adapter such as this one to convert to NPT. This listing mentions shower fixtures, so that is promising.  The title and description contradict each other on which side is BPT and which is NPT, but the product images look like it's what you need (they show female BPT threads).

Here is another possible adapter, but not chrome plated.  If you are in the UK, you may be able to find a BSP to NPT adapter easier.

G1/2B to NPT Coupling

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